2 :
A m p l i f i c a t i o n ( P a s s i v e M o d e l s )
The choice of partnering amplifiers for Passive Entry Series
loudspeakers will have significant influences on the performance
of the system. Consider the following when selecting the
amplifier:
■
With any passive loudspeaker there is a trade-off between
low frequency extension and sensitivity. Extended low frequency
response means that sensitivity is relatively low. It is advisable
therefore to select an amplifier of relatively high power
capabilities. Use of an under-specified amplifier will result in the
system sounding distorted at high level and may risk damage to
the loudspeakers.Valve or solid state amplifiers with high output
impedance should be auditioned carefully to establish that their
characteristic reduced damping at low frequencies is acceptable.
Typically, amplifiers with power outputs of 75W+ (continuous
output) will give the best results.
■
The ATC bass/mid driver voice coils are unusually large and
operate in an overhung gap. The result is that the monitors not
only demonstrate extremely low distortion at all levels but also
a greatly enhanced effective dynamic range. This exceptional
distortion performance, also combined with very wide
dispersion, will ruthlessly reveal deficiencies in ancillary
equipment. It is advisable therefore to audition your speakers
with your proposed amplifier and ancillary system. The range of
ATC amplifiers and pre-amplifiers should be your first choice.
3 :
C o n n e c t i o n ( P a s s i v e M o d e l s )
ATC Entry Series monitors are equipped with a “bi-” or
“tri-wire” connection panel that enables separate amplification
of the bass/mid driver and tweeter. Remove the linking bars
between the pairs of terminals if you wish to take advantage of
this facility.
The pairs of binding posts are laid out to match the drive unit
positions with the bass driver pair towards the lower edge of
the input panel. Ensure the multiple amplifiers used for
bi or tri-amping have equal gain and use the most powerful
amplifier for the LF driver. The terminals can accommodate
either stripped cable ends or 4mm plugs.
Always use good quality speaker cable with a 2.5mm
2
minimum
cross sectional area per conductor (79 strand). Cable of a
smaller cross sectional area or fewer strands is unsuitable.
For cable runs longer than 5m use a significantly heavier gauge
cable. Consult our dealer or consultant for specific cable
recommendations. Ensure that the positive and negative
terminals on each connection panel are connected back to the
corresponding positive and negative terminals on the amplifier.
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